revise qualifications for immunity from prosecution following a drug-related overdose.

HB 1183 revises South Dakota's law granting immunity from prosecution for drug possession charges after an overdose. It directly affects individuals experiencing a drug-related overdose who contact emergency services for medical help. The key change specifies that immunity only applies if the evidence used for any charges stems from the overdose event itself and the need for medical assistance. This clarifies eligibility for the existing immunity provision, requiring that the evidence leading to prosecution originated during the overdose situation. The bill does not expand immunity but refines the conditions under which it applies.